The phrase "one's favorite decade" refers to the time period that a person considers their most preferred or beloved out of all the decades in history. Full definition
This is one of my favorite decades to reference, though you probably wouldn't know by looking at me. (thefashionfolks.com)
This is my favorite decade, so I'm always welcoming to it. (theaugustdiaries.com)
Though Anchorman didn't come out until 2004, Ron Burgundy's classic»70s news anchor look is the perfect homage to your favorite decade. (bestproducts.com)